Thursday, November 24, 2016

Enigma research by the German Army’s codebreakers

In the period 1941-44 the cryptanalysts of the German army’s
codebreaking department Inspectorate
7/VI investigated the security of the Enigma cipher machine.

I’ve copied the relevant passages from the War Diary of Inspectorate
7/VI and as soon as I get some accurate translations I’ll post the text.

Unfortunately I don’t have the files of the period 1939-40.
However it is clear from the TICOM reports DF-190 that the double encipherment
of the indicator was identified as a security weakness and that’s why it was
changed in 1940.